Electric insulators



A ril 1, 1958 D. NIELD 2,829,192

ELECTRIC INSULATORS Filed Jan. 13, 1953 HGJ. L2

United Stats Pat ELECTRIC INSULATORS Douglas Nield, Cardiit, WalesApplication January 13, 1953, Serial No. 331,054

3 Claims. (Cl. 174-168) This invention comprises improvements in orrelating to electric insulators of the bobbin or spool type, and has forits object to provide an insulator made from a plastic which is flexibleand easily manufactured and in which is provided a comparatively longleakage path, whilst at the same time means are provided for retainingthe electric conductor in the insulator without the usual wiring orclips.

Referring to the accompanying drawing:

Figure 1 is a plan view of an insulator according to this invention,partly in section.

Figure 2 is an underside plan of the insulator shown in Figure 1.

Figure 3 is a side elevation of an insulator according to thisinvention, and

Figure 4 is a side elevation of the insulator shown in position of usesupporting a conductor.

Referring to the drawings the insulator may be moulded from polythene orpoly vinyl chloride or like plastics, which when sufliciently thin areflexible.

The insulator which is of a bobbin or spool shape is formed with agroove 1 therein, which groove is of a comparatively deep nature so thatthe sides 2, 2 of said groove are flexible, thus when a certain amountof side strain is placed on a conductor 3 (Fig. 4-) located in thegroove 1 the sides 2, 2 will flex instead of taking the strain,furthermore, an insulator according to this invention provides a longleakage track, owing to the comparatively large amount of surface whichis provided on the sides 2, 2 of the groove 1.

Formed integral with a face 2 of the insulator is a boss 4 which forms adistance piece between the main part of the insulator and the part (e.g. a port 5, Fig. 4) to which the insulator is secured by means of ascrew or bolt 6 or the like which passes through an axial hole 7 in theinsulator and boss.

2,829,192 Patented Apr. 1, 1958 ice Moulded on one or both of the sides2, 2 of the groove 1 are projections 8 which are undercut at their innerends which are adapted for retaining the conductor 3 in position on theinsulator without the necessity of wiring or otherwise securing theconductor 3 thereto.

The conductor 3 is passed over the top of the projection 8, the sides 2being flexible readily allow this operation to be effected.

This insulator is particularly adapted for the support of a conductor onelectric fencing or any other post where it is desired to support theconductor on insulators of the bobbin or spool type, or said insulatorsmay be secured to a wall or the like, or threaded onto a rod fencingpost.

I claim:

1. A plastic bobbin-type electric insulator having comparatively longthin flexible walls which form a comparatively deep groove for aconductor and a projection carried by one of the said walls and nearlyspanning the groove to a point adjacent the opposed wall of said groove,which projection acts as a means for retaining a conductor in the grooveor the insulator.

2. An electric insulator according to claim 1, wherein the projection isundercut on its inner end to accommodate an electric conductor.

3. A plastic bobbin-type electric insulator having comparatively longthin flexible walls which form a comparatively deep groove for aconductor, a projection integral with one of the walls Within the grooveand nearly spanning said groove to a point adjacent to the opposed wallof said groove, which projection acts as a means for retaining aconductor in the groove of the insulator, and a boss integral with therest of said insulator and which serves as a distance piece between therest of the insulator and the element on which it is mounted.

References Cited in the file of this patent UNITED STATES PATENTS415,504 Fowler Nov. 19, 1889 823,820 Steinberger June 19, 1906 879,068Steinberger Feb. ll, 1908 927,321 Bond July 6, 1909 1,174,002 EttingerFeb. 29, 1916 1,656,032 Birkholtz Jan. 10, 1928 2,424,687 Greene et al.July 29, 1947 FOREIGN PATENTS 677,785 Great Britain Aug. 20, 1952

